La Marmotte Granfondo Alpes Training Plan

La Marmotte Granfondo Alpes is the oldest and most iconic mountain cyclosportive in the world — and for most cyclists who care about climbing, the bucket-list event above all others. Starting from Bourg-d'Oisans at the foot of Alpe d'Huez, it covers 174 kilometers and 5,180 meters of vertical gain across four of the most legendary climbs in Tour de France history: Col du Glandon, Col du Télégraphe, Col du Galibier, and the final ascent of Alpe d'Huez. Roughly 10% of starters abandon every year — more in bad weather or extreme heat. The Galibier peaks at 2,642 meters, where thin air and 9% gradients combine to destroy riders who ignored altitude in training. La Marmotte does not care who you were in training; it only responds to who you've prepared to be on race day.

Course demands

La Marmotte's demands are stacked from the first pedal stroke: the Col du Glandon begins within 10 km and climbs 21 km at 6.9% average; the Télégraphe/Galibier combination that follows is effectively 30 km of climbing with a short valley break, culminating above 2,600 meters where the air is measurably thin. After the Galibier's long fast descent to Bourg, the final climb to Alpe d'Huez — 13.8 km at 8% average, with the opening two kilometers at 10–11% — is completed on legs that have already climbed 4,000+ meters. Mid-afternoon sun turns Alpe d'Huez into a furnace with temperatures regularly exceeding 30°C. A pacing mistake on the Glandon costs hours by the time riders reach Alpe d'Huez.

Who this plan is for

Serious road cyclists with years of climbing experience who are ready to commit to an 8-month preparation campaign for the most famous mountain sportive in the world.

What makes this plan unique

Long low-intensity rides progressing to 6–8 hours (building fat-oxidation); fasted training rides to conserve glycogen for race-day; high-altitude training camps (recommended in Alps or Tenerife in May/June); sustained threshold climbing blocks of 20–30 minutes at race pace.

What the plan targets

• High-volume aerobic endurance for 6.5–14 hour efforts on successive major climbs
• Altitude-specific threshold climbing (Galibier above 2,000 m demands 5–10% power deductions)
• Fat-oxidation efficiency — riding the long climbs at sub-threshold without glycogen depletion
• Heat tolerance for mid-afternoon July Alpine conditions on Alpe d'Huez
• Descending confidence and technical skills on long, steep Alpine descents

What you will get

• Polarized base phase (Nov–Mar) building the aerobic engine before adding climbing-specific intensity
• Pre-competition phase (Apr–Jun) with progressive threshold climbing and event simulations
• Altitude pacing targets and heat acclimatization protocols for late-June racing
• Race-day execution plan breaking the route into fueling and pacing segments